clark



g- 4, 1931- c E. CLARK 1,817,735

ROTARY COMPRESSOR I Filed April 16, 1928 4 Sheets-Sheet l g- 4, 1931- o. E. CLARK 1,817,735

RO'IIARY COMPRESSOR 4 Sheets-Sheet 2 Filed April 16, 1928 Z l' 0 A! 2 I Il 23 I I I 25 12 l 6 1O I I 16 30 gnven'co o and? I. CYLHRK Aug. 4, 1931. Q, E, CLARK I 1,817,735

ROTARY COMPRESSOR Filed April 16, 1928 4 Sheets-Sheet 3 0M3)? .E CZHRK Aug. 4, 1931- o. E. CLARK ROTARY COMPRESSOR 4Sheets-Sheet 4 Filed April l6,' 1928 mi gm w v w m Ah line 22 of Figure 1.

Patented. Aug. 4,

1 'UNl'TED STAT-ES' PATENT orrrca v OMAR E. oLA OFIDENVER, COLORADO, ASSIG1\TOR T0 GARDNER-DENVER. OMPANY, Y 0F DENVER, ooLoR-ADo n CORPORATION or DELAWARE I Rowan: comrnnssoa Application filed April 16,

to, eliminatevibration and is thoroughly lubricated, atthe same: time the air compressing portion is eflt'ectively sealed from the lubricant. t Y I The preferrel embodiment of the inven- 5 tion is illustrated in the accompanying draws "ings wherein z? Flgure 1 is a vertlcal longitudlnal sect1onal view'through the structure.

Figure 2 1s a cross sectional view on the Figure 3 is a detail end View of the eccentric adjusting means. Figure 4 is a sectional View on the line 4- 4 of Figure 2. F Figure 5 is a sectional View on the line 5 ,5 of Figure 2. In the disclosure, a casing is employed,

comprising a peripheral #wall 6,-to which end;

heads 7- and 8 are secured by'bolt-s 9. The wall 6 and heads 8 are chambered, as illustrated at 10 and 11 to provide'for the circulation'of a cooling medium. The peripheral wall has an annular inset portion 12. iIhis inset portion is spaced-from the heads 7 and .3; 8, and at the sideadjacentto the head 7 is providedwith a bearing surface 13. Secured to the opposite side of said inset portion by bolts 14 is an 'inwardlyextending ring or abutment-wall 1.5 that is spaced from the ad- 4 0 jacent head 8. The casing provides an i ternal rotor chamber, of which the inner face 16 of thefinset portion 12 constitutes the outenwall.

A shaft l7 extends across the casing and.

has roller bearings 18 in the heads '57 and 8.

.34. that are thus locate on opposite sides of 1928. Serial K0. 270,447.

2 This shaft is provided withinthe rotor cas-' ing with an integral and relatively small ecccntric l). Onisaid eccentric is journaled a larger eccentric 20. Surrounding the central portion of this eccentric 20 is a wear sleeve 21, on which is journaled the hub 22 of a hollow rotor. This rotorincludes said hub 22, a radial web 23 springing centrally from the hub, and a circular peripheral wall 24 that" rolls on the surface 16 of the inset portion 12 of the annular wall'6. The web 23 is preferably braced by opposite ribs 25 and is perforated, as illustrated at 26 between said ribs, so as to aflord free communication between the ends of the rotor. Therotor is of the Gause-Conrady type,'in hat itis slid able longitudinally of andon the shaft and is provided at one end with an enlarged termin-a1 flange or head 27 that bears against the inner face of the inset abutment wall 15. ,At

ing annularflange 28 that bears against the abutment face or wall 13 of the inset portion 12'. These abutting faces, it will be understood, are carefully dressed so as to afford 70 as nearly as practicable air and liquid-tight joints. The, rotor is permanently held in; said bearing'engagement by means of a ring 29 that is pressed against the flange 28 by springs 30 interposed between saidring and the adjacent head 7. The ring is held against rotation by dowel pins 31 carried by the heads 7 and slidably engaged in the ring. The ends of the eccentric 20 are longitudinally split, as shown at 32 to form contractile sleeves. that will grip the eccentric 19 of the shaft v17, andsurrounding said end portions are split collars 33 car ying counter-weights.

the hub 22 and are within the peripheral wall 5 24 of the rotor.

Contracting bolts 35, engaged in terminal cars 36, formed on said contractile'collars 33, I

serve to not only draw the collars tightly upon the terminal pprtions of the eccentric '99 I its other end it is provided with anoutstand-- sov ' ing all in fixed relation. The co'llars'33 are however, preferably keyed, as illustrated at 37 (see Figure 3) to the eccentric 20.

One of the split collars 33, as shown in Fig;

ure 3, has a portion cut-away, as illustrated at 38, and an abutment pin 39 carried by the shaft 17, is located in this seat or socket formed by the cut-away portion; On opposite sides of'this abutment pin are adjusting screws 40 threaded through the collar and abutted against opposite sides of the pin 39. These'screws are held against accidental rotation by jamb nuts 41. It will thus be evident that by-adjusting the screws 40, the cam -20 is turned with respect to the cam 19, there by adjusting the rotor 24 toward and from the peripheral wall 6 of the casing By referring to Figures 1 and 2, it will be ngted that the peripheral wall 24 serves to divide the rotor chamber into an outer compression chamber41 and an inner chamber 42, the latter constituting a reservoir for lubricant, and that these chambers are sealed against each other by the bearing of the head 27 of the rotor against the abutment wall 15 and the bearing of the flange 28 of the rotor against the abutment wall 13. Therefore neither air or gas can pass fromthe chamber 41 into the chamber 42, nor can lubricant pass from the chamber 42 into the compression chamber 41. Lubricant is supplied to the chamber'42 through a port 43 formed in the top of thecylinder wall 6' and closed by a detachable plug 44. This port 43 opens into the space between the head 8 and the abutment wall 15. This lubricant, it will be noted, has free access to all the internal parts of the apparatus, and as the shaft 17 rotates, the counterweights 34 will serve to splash it about within the chamber 42. More than that, ports 45 open from said chamber 42 to the bearings 18, and the hub of the rotor has a passageway 46 that opens to the bearing sleeve 21, said bearing'sleeve in turn may i haveportage 47 to grooves 48 within the'rear eccentric 20 and opening back into the chamber 42. The lubricant can be drained through a drawofi opening 49 normally closed by a plug 50.

The compression chamber 41' is supplied through a transverse series of ports 51 (see Figures 2 and 4) that open on one side of an abutment 52 that extends across the chamber 41a and bears against the peripheral wall 24 of the rotor. These inlet ports 51 communicate with afcommon intake chamber 53, across which is placed a screen 54. An outstanding nipple 55 is internally threaded to receive a supply pipe if such is desired. On the opposite side of the abutment 52 is formed on the casing an outlet chamber 56 opening into the compression chamber. 41* through a series of ports 57-(see Figures]. and 2). In

these ports 57 are located-ring disk valves 58 placed in housings 59 and held in place by suitable pressure stems 60 that are borne upon by cap screws'61. An outlet port from the chamber 56 is shown at 62.

The abutment 52 may be of any desired character but as shown, consists of slidably overlapped plate sections 63,.onwhich are placed bearing caps 64, These I caps are pressed upon by coiled springs located-in chambers 66 and in turn borne upon by plug closures 67 threaded into the outer ends of the chambers 66.

lVith this structure, it will be evident that when the shaft 17 is rotated, the rotor will also be rotated and because of its eccentric mounting, its periphery will ride the inner face 16 of the peripheral wall. As a consequence, air taken in through the ports 51, will be compressed and delivered into the outlet chamber 56. Should wear take place between the peripheral wall 24 of the rotor and the surface 16, by adjusting the cam 20 with respect to the shaft 17 and its cam 19, this wear can be taken up. The end wear due to the movement of the end surface 27 of the rotor against the abutmentwall 15 and the corresponding movement of the flange 28 against the abutment surface 13, is automatically taken up as in the Gause-Conrady type of apparatus, save that in thepresent structure, these bearings are always maintained by the springs 30, whose power is sufiicient to overcome any outward or back pressure on the flange 28, due to the compression of the air or gas in the chamber 41*". And in this respect,it will be noted by reference to Figure 2, that the springs are utilized only on that portion of the flange'which is subjected to material outward pressure, and that they are located closer and closer together as they are located nearer and nearer to the outlet ports 57, so that the outward pressure is moreevenly counterbalanced as it increases. Obviously this canalso be obtained by using springs of varying degrees of resistance.

a From the foregoing, it is though that the 'rotor having a hubmounted on the eccentric, said eccentric projecting beyond the opposite sidesof the hub, and counter-weights havlng hubs clamped to the projecting ends of the eccentric and located on opposite sides. of the hub.

2. In a rotary compressor, the combination with a casing having a rotor chamber,

of a shaft therein, an eccentric rotatable on the shaft, an abutment carried by the shaft, adjusting bolts carried by the eccentric, and engaging theIo'pposite sides of the abutment tOxliOld the eccentric indifferent positions with respect to the shaft, and a rotor on the eccentric. e

3. In a rotary compressor, the combination with a casing having a rotor chamber, of a shaft therein, an-eccentrierotatably mounted onthe shaft, :1 counterwe ght carried by the eccentric, means carried by the counterweight for adjusting the eccentric on theishaft and holdlng 1t in adjusted position therein, and

n I and a rotor mountedon the eccentric,

.on the shaft, and eccentric. Y

a rotor mounted on the eccentric.

4! In a rotary compressor,the combination with a casing having a rotor chamber, of a shaft therein, an eccentric rotatably: mounted on the shaft, a counterweight carried .by the eccentric, an abutment carried by the shaft, adjusting and holding screws carried by the counterweight and engaging the abutment,

6. In a rotary compressor, the combination with a casing having a rotor chamber, of a sha'fti'n the chamber, an eccentric journaled on' the shaft and having a split sleeve, a counterweight having a contractile hub on the split sleeve of the eccentric, means for contracting the hub on'the sleeve and the sleeve a rotor mounted on the 7. In a rotary compressor, the combination with a casing having a rotor chamber, of a shaft having an eccentric in the'chamber, a second eccentric 'jou'rna'led on the first eccentric and having a split sleeve, a counterweight havingl'a contractile hub on the split sleeve of the second eccentric, means for contracting the hub qn the sleeve and the sleeve on the first eccentric, and a rotor mounted on the second eccentrlc.

8; In a rotary compressor, the combination shaft having an eccentric in the chamber, a

second eccentric journaled on the first ec;

centric and having a split 'sleeve 'a counterweight having a contractilehub on the split sleeve of the second eccentric,- means for contracting the hub on the sleeve and the sleeve on the first eccentric, an abutment pro ecting from the shaft, adjusting and holding v bolts on the counterweight, and engaged with the abutment, and a rotor mounted on the second eccentric.

'- 9. In a rotary compressor,"thecombination with a casing having a rotor chamber, end heads closing the chamber, and abutment walls inside and spaced from the end heads, of a shaft journaled in the end heads, a hollow rotor eccentrically mounted on the shaft and having end portions rotatably bearing against the side faces of the abutment walls,

said rotor having a peripheral wall dividing the rotor chamber into an outer compression chamber and an inner lubricant chamber and said rotatable portions closing the said inner and outer'chambers against communication, and means whereby lubricant is supplied to the inner chamber.

10. In a rotary compressor, the combination with a casing having a rotor chamber, end heads closing the chamber, and abutment walls inside and spaced from the end heads, of a shaft journaled in the, end heads, a hollow r'otor eccentrically mounted on the shaft and having end portions rotatably bearing against the side faces of the abutment walls, said rotor having a peripheral wall dividing the rotor chamber into an outer compression chamber and an inner lubricant chamber and said rotatable portions closing the said inner and outer chambers against communication, and means whereby lubricant is supplied to the inner chamber, said chamber opening through the rotor to the spaces between the heads and the abutmentwalls and having access to the shaft bearing.

11. In a rotary compressor, the combination with a casing having a peripheral wall and end heads, of an outstanding abutment wall in the casing at one end and spaced from the head, an inset annular wall in the other end of the casing spaced from the other head, a shaft journaled in the heads, and a hollow rotor having a hub eccentrically journaled in the shaft and having an end abutting the inner face of-the inset abutment wall and spaced from the adjacent head, said rotor having anoutstanding flange at its other end abutting the outer face of the outstanding abutment wall and spaced from the adjacent head, a ,ring in the space and bearing against the flange, springs interposed between the adjacent head and ring, counterweights fixed to the shaft within the rotor, and means whereby lubricant can be supplied to the interior of the rotor, and to the spaces between .with a. casinghaving a rotor chamber, of a th heads and abutment Walls and to the bearings of the rotor hub and shaft.

12. Ina rotary compressor, the combination with a casing having a rotor chamber, of a shaft therein, an eccentric rotatably mounted onv the shaft, a counterweight, means for mounting the counterweight on the eccentric, said mounting means constitut ing means for securing the eccentric against rotation on the shaft, and a rotor on the eccentric operating in the rotor chamber.

. 13. In a rotary compressor, the combination'with a casing having arotor chamber,

of a shaft therein, an, eccentric rotatably mounted on the shaft and haying a contractile portion, a counterweight having a contractile portion on the contractile portion of 10 the eccentric, means for contracting the last mentioned portion and thereby the first men tioned portion, and-a rotor mounted on the eccentric and operating inthe rotor chamber.

In testimony whereof, I afiix my signature.-

OMAR E. CLARK. 

